It is highly suggested for developer to find out ways to conserve the communication traffic between hosts as much as possible.
Data Quantization helps in reducing the size of one message.
Dead Reckoning helps in reducing the number of exchanged messages.
If there are any unnecessary messages then it is better not to exchange them at all. For instance, let's say there is a quest that gamer can see. Rather than showing the entire string of quest, it is much more efficient to show the resource already saved in the game client.